No. To build muscles, you need lots of proteins. Eating one meal a day doesn't give you enough energy.
Not neccesarily, that would depend more on your state of nutrition. However, eating only one meal isn't the most sensible approach, regardless of how healthy and well balanced that meal might be.
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You must make sure to NOT eat only one meal a day. This will only slow your metabolism. Instead, try eating around five small meals a day. This will get your metabolism working and the pounds should come off.
No, it's an extremely bad diet.
The "when" of eating fruits aren't as important as just getting them in your diet. Focus more in incorporating the fruit in your diet than the time of day or how long before or after a meal.
All of it.
Eating only 700 calories each day isn't healthy, being super skinny isn't healthy. get your priorities straight and stop obsessing.
It is not normal to eat just once a day. I would recommend seeing a dietician; they can set you straight on what she should be eating, and how much.
Try only eating one good meal per day. If you eat a very good healthy and big meal it wont be a problem and you can stay lean and healthy fast. Plus your body will adapt too it in no time at all.
There is no day during Lent when only one meal may be eaten. On Ash Wednesday and Good Friday Catholics should eat only one major meal and the other two meals must be, combine, less that the major meal.